1. Universitas Padjadjaran,Department of Electrical Engineering,Bandung,Indonesia
2. Universitas Brawijaya,Faculty of Mathematics and Natural Sciences,Malang,Indonesia
3. Universitas Pembangunan Nasional Veteran,Department of Computer Science,Jawa Timur,Surabaya,Indonesia
4. Institut Teknologi Bandung,Department engineering physics,Bandung,Surabaya,Indonesia